My musts would be the Kurosawas, Bergmans, Face in the Crowd, Paths of Glory, Anatomy of a Murder, 400 Blows, NxNW, Touch of Evil, South Pacific, Oklahoma, Searchers (racist), Giant (least repulsive of the regrettable James Deans), Rififi, Panther Panchali, Old Yeller & Shaggy Dog (if you want to know the head of a child of the 50s), Invasion of the Body Snatchers, Ladykillers, Mister Roberts, Guys & Dolls, Diabolique, Moby ****, The Red Balloon, 12 Angry Men, 7th Voyage of Sinbad, Some like it Hot, Black Orpheus, Plan 9 From Outer Space, and my favorite (along with NxNW), Marty